Compaq 850 manual Drive Fault Prediction, PNP Support, Smart Hard Drive detects imminent failure

Technical Reference Guide

7.5.4 DRIVE FAULT PREDICTION

The Compaq BIOS directly supports Drive Fault Prediction for IDE-type hard drives. This feature is provided through two Client Management BIOS calls. Function INT 15, AX=E817h is used to retrieve a 512-byte block of drive attribute data while the INT 15, AX=E81Bh is used to retrieve the drive’s warranty threshold data. If data is returned indicating possible failure then the following message is displayed:

“1720-SMART Hard Drive detects imminent failure”

7.6PNP SUPPORT

The BIOS includes Plug ’n Play (PnP) support for PnP version 1.0A. Table 7-5 lists the PnP functions supported.

Table 7-5. PnP BIOS Functions

	Table 7-5.
	PnP BIOS Functions
Function	Register
00h	Get number of system device nodes
01h	Get system device node
02h	Set system device node
03h	Get event
04h	Send message
50h	Get SMBIOS Structure Information
51h	Get Specific SMBIOS Structure

The BIOS call INT 15, AX=E841h, BH=01h can be used by an application to retrieve the default settings of PnP devices for the user. The application should use the following steps for the display function:

1.Call PnP function 01(get System Device Node) for each devnode with bit 1 of the control flag set (get static configuration) and save the results.

2.Call INT 15, AX=E841h, BH=01h.

3.Call PnP “Get Static Configuration” for each devnode and display the defaults.

4.If the user chooses to save the configuration, no further action is required. The system board devices will be configured at the next boot. If the user wants to abandon the changes, then the application must call PnP function 02 (Set System Device Node) for each devnode (with bit 1 of the control flag set for static configuration) with the results from the calls made prior to invoking this function.

Compaq Deskpro EXS and Workstation 300 Personal Computers 7-15

Featuring the Intel Pentium 4 Processor

First Edition - December 2000